Abstract
AbstractA class of balanced dual-band bandpass filters (BPFs) with planar transversal-signal-interference coupled-line sections is reported. In their building balanced dual-band BPF stage under differential-mode excitation, a second-order quasi-elliptic-type dual-band bandpass filtering transfer function is obtained. Specifically, from the transversal interaction among their two open-ended and virtually-short-ended half-wavelength coupled-line paths, sharp-rejection differential-mode dual passbands with several out-of-band transmission zeros at both sides are realized. To attain high common-mode suppression levels within the differential-mode passbands, two open-ended line segments are connected at the symmetry plane of the devised balanced dual-band BPF stage. Moreover, higher-order schemes based on in-series-cascaded multi-stage designs to further increase differential-mode selectivity and in-band common-mode rejection are illustrated. The operational principles and parametric-analysis design rules of the engineered transversal-coupled-line-based balanced dual-band BPF approach are detailed. Additionally, for a rigorous interpretation of their zero/pole characteristics, a digital-modeling framework is applied to them to connect RF balanced filters with their discrete-time versions. For practical-validation purposes, a microstrip prototype of two-stage/fourth-order balanced dual-band BPF is built and tested. It exhibits measured differential-mode dual passbands with center frequencies of 1.464 GHz and 2.294 GHz, 3-dB fractional bandwidths of 8.74% and 9.68%, and in-band common-mode rejection levels above 23.16 dB and 31.36 dB, respectively.
Funder
H2020-MSCA-COFUND programme
Spanish Ministry of Economy, Industry, and Competitiveness
Publisher
Cambridge University Press (CUP)
Subject
Electrical and Electronic Engineering
Reference23 articles.
1. Ultra-wideband bandpass filter using broadband planar Marchand balun
2. Systematic evaluation of spikes due to interference between cascaded filters;Morini;IEEE Transactions on Microwave Theory and Techniques,2018
3. Balanced Dual-Band Bandpass Filter With Multiple Transmission Zeros Using Doubly Short-Ended Resonator Coupled Line
4. Multiband Balanced Filters With Controllable Bandwidths Based on Slotline Coupling Feed
5. Compact balanced dual-band BPFs based on short and open stub loaded resonators with wide common-mode suppression;Wei;IEEE Transactions on Circuits and Systems II: Express Briefs,2020
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